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| Section | Objectives |
|---|---|
| Topic 1: Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements |
| Topic 2: Structural Inspection | - Structural loads and related code requirements - Mass timber structural elements - Connections and fastening systems |
| Topic 3: Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements |
| Topic 4: Construction Fire Safety | - Construction-phase fire safety requirements - International Fire Code requirements - Protection of mass timber during construction |
| Topic 5: Special Inspection Requirements | - Inspector duties and responsibilities - Special inspection procedures for tall mass timber buildings - Inspection of connections and protective materials |
| Topic 6: Code Compliance and Related Requirements | - Energy code requirements applicable to mass timber buildings - Documentation and verification of compliance - Sound transmission requirements |
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NEW QUESTION # 48
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, what is the required tolerance in inches between the steel beam web and CLT?
Answer: D
Explanation:
The construction detail identifies a 1/2-inch tolerance between the steel beam web and the adjacent CLT panel. Therefore, option B is correct.
This is principally a construction-document interpretation question rather than a generic prescriptive IBC dimension. The 2021 IBC does not establish one universal steel-web-to-CLT clearance applicable to every mass timber connection. The required clearance is project specific and is established by the registered design professional through the approved structural drawings and connection details.
The tolerance provides erection clearance for placement of the prefabricated CLT around the steel member while accounting for fabrication and installation variation. It must not be arbitrarily reduced or increased because the gap can affect panel fit, bearing conditions, fastener alignment, fire-protection continuity, acoustic treatment and any specified joint-filling material.
Under the special-inspection framework, the inspector must compare the installed connection directly with the approved construction documents. Any condition that does not maintain the specified 1/2-inch clearance-or any undocumented field modification to the CLT or steel connection-must be reported and resolved through the registered design professional rather than accepted solely on the contractor's direction.
References/Topics: Approved structural details; 2021 IBC Sections 1704.2 and 1705.5; inspection of mass timber erection, anchorage and connections.
NEW QUESTION # 49
Concealed spaces in a Type IV-C building must be protected with:
Answer: D
Explanation:
In Type IV-C construction, combustible construction forming concealed spaces must receive noncombustible protection providing an assigned time of at least 40 minutes. Consequently, option D is correct.
Type IV-C permits substantial portions of mass timber to remain exposed within occupied interior spaces, subject to the applicable construction and fire-resistance requirements. That permission does not extend unchanged into concealed spaces. Concealed combustible surfaces create a different hazard because fire can spread above ceilings, inside shafts, or within service cavities without immediate detection. Section 602.4.3.5 therefore imposes a specific 40-minute noncombustible protection requirement.
An NFPA 13 sprinkler system is generally required for tall mass timber buildings, but sprinkler protection alone is not the prescribed substitute for this concealed-space protection. Fire-retardant-treated wood is still combustible and does not constitute the required noncombustible protective membrane. Option C is also incorrect because the concealed-space rule is more specific than the provisions governing exposed surfaces in occupied spaces.
Inspection should occur before closure so that membrane continuity, board orientation, fastener spacing, joint treatment, penetrations, and protection around connection hardware can be fully observed.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.5; Table 722.7.1(1); concealed combustible construction in Type IV-C buildings.
NEW QUESTION # 50
Regarding water supply for the protection of buildings under construction, when combustible building materials of the building under construction are delivered to a site, the minimum fire flow provided shall be
_____ gpm.
Answer: D
Explanation:
The minimum required fire flow is 500 gallons per minute. Therefore, option C is correct.
Under 2021 IFC Section 3313.2, an approved water supply must be available when combustible building materials for the building under construction are delivered to the project site. The hydrant supplying the required flow must be located within the prescribed distance of the combustible materials as measured along an approved fire apparatus access route. Where one hydrant cannot provide coverage to all combustible material locations, additional hydrants are required.
The 500-gpm requirement is the initial minimum associated with the delivery of combustible building materials. It should not be confused with the potentially greater fire-flow requirements applicable after vertical construction of a Type III, IV, or V building begins. Depending on fire separation distance and the building's calculated final fire-flow demand, a larger supply may be required under subsequent provisions.
Options A and B provide inadequate suppression capacity. Option D is not the baseline amount prescribed for the condition stated in the question. Inspectors and site safety personnel should verify that the water source is operational and accessible before substantial quantities of mass timber arrive on-site.
References/Topics: 2021 IFC Sections 3313.1 and 3313.2; construction-site water supply and combustible building materials.
NEW QUESTION # 51
Sealants used to resist passage of air in construction Type IV-A, shall be in accordance with which of the following standards?
Answer: B
Explanation:
ASTM C920 is the required standard for sealants used under the IBC mass timber air-sealing provision.
Option C is therefore correct. Section 703.7 applies to Type IV-A construction and requires compliant sealant or adhesive at specified interfaces involving fire-resistance-rated mass timber elements.
The sealing requirement reduces the movement of air, heat, and combustion gases into gaps that could expose additional timber surfaces and undermine the rated performance assumed by the approved design. The sealant must not merely appear to close the opening; it must be the specified product and installed within its approved joint dimensions and substrate conditions.
ASTM A36 is a structural steel material specification. ASTM E119 establishes procedures for fire testing building construction and assemblies but does not qualify elastomeric sealant products. ASTM F1667 covers driven fasteners such as nails, spikes, and staples and has no application to this sealing requirement.
Under Section 1705.20, installation is subject to periodic special inspection where the Section 703.7 sealant is applied. Inspection should occur before concealment and confirm continuity, adhesion, backing, joint depth, surface cleanliness, and compliance with the approved documents.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; Type IV-A construction; ASTM C920.
NEW QUESTION # 52
Refer to the figure by clicking on the EXHIBIT button above.
In Type IV-B construction, unprotected portions of mass timber as shown in the Figure is limited to an area equal to not more than what percentage of the base floor area?
Answer: D
Explanation:
The figure depicts an unprotected portion of the mass timber ceiling . For Type IV-B construction, Section
602.4.2.2.2, Exception 1.1, limits unprotected ceiling areas-including attached mass timber beams-to 20 percent of the floor area of the applicable dwelling unit or fire area. Option B is therefore correct.
The percentage is based on floor area rather than total ceiling surface area. For example, where the associated fire area contains 1,000 square feet of floor area, the maximum ceiling exposure permitted under this particular exception would be 200 square feet, subject to the additional separation and mixed-exposure provisions.
The 40-percent value in option D applies to mass timber walls, including attached columns , rather than ceilings. The 15-percent and 30-percent values are not the prescribed Type IV-B ceiling exposure limitations in the 2021 IBC.
The inspector must additionally determine whether another exposed wall or ceiling region exists nearby.
Section 602.4.2.2.4 imposes a 15-foot separation requirement, and Section 602.4.2.2.3 controls situations where both wall and ceiling surfaces are intentionally exposed.
References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B ceiling exposure limitations.
NEW QUESTION # 53
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